94 Olds Cutlass Ciera

I have a 1994 Cutlass Ciera automatic tranny with overdrive.
The car has 106,000 miles on it , motor runs fine. When its cold it takes about 5 minutes before it will go into drive but if I put it into low than back into drive it will takeoff right away. The transmission fluid is changed between every 5 to 10,000 miles.
Can someone give me an idea what might be wrong.
Thanks